George e



(No Model.)

G. E. HART. MECHANISM FOR MAKING TOOTHED RINGS.

No. 596,405. Patented Dec. 28,1897.

' the finished ring.

' UNITED STATES PATENT FFIcE.

GEORGE E. HART, OF WVATERBURY, CONNECTICUT, ASSIGNCR TO THE VATERBURYVATCH COMPANY, OF, SAME PLACE.

MECHANISM FOR MAKING TOOTHED RINGS.

SPECIFICATION forming part of Letters Patent No. 596,405, dated Decemberas, 1897.

A li ation fil d, August 18, 1897. Serial No. 648,709. (No model.)

To aZZ whom it may concern: I

Be it known that I, GEORGE E. HART, o Waterbury, in the county of NewHaven, and in the State of Connecticut, have invented certain new andusefullmprovements in Mechanism for Making Toothed Rings; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,in Which- Figure 1 is a perspective view of the ringform blank after thenotch has been punched in its inner periphery. Figs. 2 and 3 arerespectively perspective views from opposite sides of the completedtoothed rings. Fig. 4 is a perspective View of the dies and plungershown separated from each other; and Fig. 5 is a vertical section of thesame mounted and in position to operate on the blank shown in Fig. l tocomplete the ring, as shown in Figs. 2 and 3.

Letters of like name and kind refer to like parts in each of thefigures.

The object of my invention is to provide a mechanism for the cheap andrapid manufacture of rings having gear-teeth on opposite sides; and tothis end said invention consists in the mechanism characterized by thefeatures. substantially as hereinafter specified.

The toothed ring A that is produced by means of my mechanism isillustrated in Figs. 1 and 2 and has on one side a continuous series ofinternal gear-teeth a and on the opposite side only two such teeth a,the space between the latter being cut out or a notch a formed clearthrough to the other side of the ring. In making said toothed ring Imake a blank in the form of a plain ring, with a notch a cut in itsinner periphery, as shown in Fig. 1. The internal diameter of said ringis slightly greater than in the finished ring, and the external diameteris slightly less than in Said blank is now subjected to the action ofdies that simultaneously form the complete set of teeth on one side andthe partial set on the other side and finish off the surfaces of thenotch. The pressure to which the blank is subjected by the dies to formthe two sets of teeth by compressing the metal in an axial directioncauses it to expand radially and results in the proper internal andexternal diameters being given the completed ring, the internal diameterbeing determined bya cylindrical block or plunger of proper size placedwithin the ring-blank and the external diameter being determined by aninclosing wall of proper size.

The dies for forming the two sets of teeth are substantially alike, thedie B for producing the full set of teeth being a cylindrical bodyhaving at one end a circular series of tooth-form projections 12 and band at its other end a fiangeb, by which it may be fastened, as byscrews, to a suitable holder C. The die D for producing a partial set ofteeth consists of a cylindrical body of the same diameter as the otherdie-body and having on one end a projection d, corresponding to thespace between the two teeth, and a segmental projection d,wh oseextremities (Z and and d are given such form as to complete the die forsaid two teeth. Such die D is also flanged at its opposite end and ismounted within'a suitable holder E. Also, mounted within the holder E isa die-ring F, whose internal diameter agrees with the external diametersof the die-bodies and of the completed toothed ring.

Within an axial opening passing entirely through the die B is acylindrical block G, having a diameter the same as the internal diameterof the finished toothed ring and provided on its side with alongitudinal rib g, that is tooth form in cross-section to receivethe-notch a of the ring-blank. The block G projects above the end of thedie B, that has the tooth-form projections 19, and is yieldinglysupported in such position by means of a coiled spring H, placed withina cavity in the holder C and pressing at one end against the head i of.a plunger I, upon which head bears a stem or shank g on the block G. Aflange 9 0n the block G, by engaging a shoulder on the die 13, limitsthe outward movement of said block.

In the use of my mechanism the blank-ring shown in Fig. 1 is slippedover the projecting end of the block G,with its notch a engaging the ribg, and then the two dies, end to end, are brought together upon thering, which when the dies engage the same is encircled by the die-ringF. The projecting end of the block G is engaged by the end of the die D,and as the two dies compress the metal of the ring between them as theyapproach the block G yields before the die D, as itmay by reason of theyielding support afforded it by the spring. As the notch a in the blankis only roughed out, its finished form is given it by the rib 9 when theblank is subjected to the pressure of the two dies, as described, andthe proper internal and external diameters of the finished ring aregiven by the diering E and the block G, respectively, against thesurfaces of which the inner and outer peripheries of the ring are forcedby the diepressure.

The product of my apparatus is a finished one-piece toothed ringrequiring neither cutting, milling, nor latheWork.

Having thus described my invention, What I claim is- 1. In an apparatusfor making toothed rings, the combination of a die to encircle a blank,a block to be encircled thereby, and a die having tooth-formprojections, to engage the side of the blank, substantially as and forthe purpose specified.

2. In an apparatus for making toothed rings, the combination of dies foroperating on opposite sides of a ring-blank, having each, tooth-formprojections, a die to encircle said blank, and a block to be encircledthereby, substantially as and for the purpose described.

3. In an apparatus for .making toothed rings, the combination of diesfor operating on opposite sides of a ring-blank, a die to encircle saidblank, a block to be encircled thereby, and a movable support for saidblock, substantially as and for the purpose described.

4:. In an apparatus for making toothed rings, the combination of diesfor operating on opposite sides of a ring-blank, a die to encircle saidblank, a block to be encircled thereby, and a yielding support for saidblock, substantially as and for the purpose described.

5. In an apparatus for making toothed rings, the combination of dies foroperating on opposite sides of a ring-blank, a die to encircle saidblank, and a block to be encircled thereby, having a rib to engage anotch in the blank, substantially as and for the purpose described,

In testimony that I claim the foregoing I have hereunto set my hand this9th day of August, 1897.

GEO. E. HART.

Witnesses:

S. L. ARTHUR, CHARLES S. CHAPMAN.

